* {
	padding: 0;
	margin: 0;
}
#jisuanqi {
	width: 420px;
	height: 680px;
	background-color: black;
	position: relative;
	margin: 10px auto;
}
#num {
	width: 420px;
	height: 80px;
	position: absolute;
	left: 0px;
	top: 80px;
	border: none;
	outline: none;
	background: transparent;
	color: white;
	font-size: 40px;
	text-align: right;
}

.butt {
	width: 80px;
	height: 80px;
	border-radius: 50%;
	background: #333333;
	position: absolute;
	left: 20px;
	bottom: 120px;
	cursor: pointer;
	color: white;
	text-align: center;
}
span {
	display: block;
	height: 80px;
	line-height: 80px;
	color: white;
	font-size: 30px;
}
#num0 {
	width: 180px;
	height: 80px;
	border-radius: 40px;
	bottom: 20px;
}
#dian {
	left: 220px;
	bottom: 20px;
}
#dengyu {
	left: 320px;
	bottom: 20px;
}
#num2 {
	left: 120px;
}
#num3 {
	left: 220px;
}
#jia {
	left: 320px;
	bottom: 120px;
}
#num4 {
	bottom: 220px;
}
#num5 {
	left: 120px;
	bottom: 220px;
}
#num6 {
	left: 220px;
	bottom: 220px;
}
#jian {
	left: 320px;
	bottom: 220px;
}
#num7 {
	left: 20px;
	bottom: 320px;
}
#num8 {
	left: 120px;
	bottom: 320px;
}
#num9 {
	left: 220px;
	bottom: 320px;
}
#cheng {
	left: 320px;
	bottom: 320px;
}
#clear {
	left: 20px;
	bottom: 420px;
}
#zhengfu {
	left: 120px;
	bottom: 420px;
}
#baifen {
	left: 220px;
	bottom: 420px;
}
#chu {
	left: 320px;
	bottom: 420px;
}
#dengyu,#jia,#jian,#cheng,#chu{
	background-color: #FF9500;
}
#baifen,#clear,#zhengfu{
	background-color: #A6A6A6;
}
#baifen span,#clear span,#zhengfu span{
	color: black;
}